I'm currently syncing a folder to online-only access via GoodSync using the Dropbox API that they have implemented. I was forced to do this because using the Dropbox desktop client my files were uploadinging without consistent accurracy. Files were being placed in incorrect folders and I could not monitor the progress or stop and start it.
GoodSync does a good job of verifying my upload activity, but upload speeds to Dropbox are severely throttled to less than 3MB/s, whereas I could be seeing up to 1GB upload speeds with my connection.